Although most people think of diamonds as being perfectly colorless, most diamonds show slight traces of yellow or brown hues. GIA’s D-to-Z Color Scale is used to systematically evaluate the depth of a diamond’s color, with the saturation of yellow or brown hues increasing from the colorless D through to Z. Color ranges within this scale may be described as follow: - D – F: Colorless - G – J: Near-colorless - K – L: Faint - N – R: Very light - S – Z: Light E to J color diamonds with a gray hue a